My son ask me?
I'm sorry, I don't completely understand your question. You would like to find the first tweet for a given account? If so, my only suggestion would be to go as far back as possible using the Twitter interface (just scroll down).
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8 Twitter tips that will make 2015 your year.
Reach is the ultimate tool to discover who the biggest influencers are among your followers and who you need to engage with to get the biggest possible reach.